fix: Advertisement dashboard and upload page layout

[Axiver]

Description

Fixes styling issues with the advertisement dashboard and upload pages

Changes to existing pages/components

• Made both the advertisement dashboard and upload pages take up the full height of the page
• Removed the p-8 and bg-base-200 classes from the AdvertisementDashboard page to match consistent styling with the other admin pages
• Removed justify-center and items-center from the Sidebar component
• The advertisement upload page now highlights the Advertisement button on the Sidebar

Types of Changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Issue fix (non-breaking change that addresses existing opened issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Refactoring change (refactoring change must not apply any form of functional change)

Fixes

N/A

Notion Task Coverage

N/A

Checklist

• [x] Related issues linked using fixes #number. / There is no issue fix.
• [x] Unit tests or E2E tests added for any new feature changes. / There is no new feature that requires test.
• [x] Ensured that there's no linter errors.
• [x] Ran the full set of testings and coverage reports exceed 80%. / There is currently no test.
• [x] All Merge Conflicts have been fully resolved.
• [x] Branch is rebased off the target branch.
• [x] This PR is complete and does not have incomplete work that'll break the application.

[github-actions[bot]]

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